Engine



July 24, 1934. Ay 1 MEYER 1,967,446

l ENGINE Original Filed June 1l, 1929 IN VEN TOR.

Andr@ Myer v ATTORNEY.

- cated at the crankshaft front end and is deperipheral surface of the iiywheel portions l2 Patented July 24, 1934 1,967,446

ENGINE Andre J. Meyer, Detroit, Mich., assignor to Continental Motors Corporation, Detroit, Mich., a corporation of Virginia.

Original application June 11, 1929, Serial No. 370,085. Divided and this application April 17, 1930, Serial No. 445,173

19 Claims. (Cl. 'M -6) This/invention relates to engines and refers which will be presently apparent. Thel hub l0 more particularly to vibration dampers for is provided with a plurality of spaced recesses crankshafts of engines particularly of the inor pockets 14 about its periphery in which shoes ternal combustion type. My invention provides 15 are supported and adapted to move radially '5 improvementslover the well known fLanchester with respect to the hub. Springs 16 seated f damper and like the Lanchester damper is against thevbottom of each recess or pocket i4 adapted for cooperation with the usual flywheel are adapted to act radially against the shoes l5, at the rear of the crankshaft. My damper in friction material 1'7 carried by the outer surface the embodiment illustrated is adapted to be loof each shoe being adapted to engage the inner cti signed to damp the torsional vibrations of the and 13, the springs exerting a force to yieldingly crankshaft,v these vibrations being objectional engage the shoes with the flywheel portions. It especially in multi-cylinder internal combustion will be noted that the shoes are located interengines such as are commonly used for promediate the flywheel portions and the hub and .-15 pelling motor vehicles. are disposed about the periphery of the hub. 70

Heretofore in dampers of the aforesaid type, Furthermore, it may be noted that these shoes the auxiliary damper flywheel is yieldingly conare substantially evenly spaced aboutl the perinected to the crankshaft,Y a spring regulating phery of the hub. and determining the amount of friction resist- The flywheel portions are arranged to be loose- *2 0 ance to yielding in the damping operation. I ly centered by shoulders 18 and 19 and end plates 75 have determined that this device is unsatisfacand 21, assisted somewhat by the hub portory as ordinarily `constructed in that the tions 22. The flywheel portionsare thus mountdampel d0es I10t funCtiOn plOpelly for the ed coaxial with the hub and independently range of speeds ordinarily experienced in enjournaled thereon to rotate about the hub, there- 125 eines of the character referred to. The spring by permitting the flywheel portions to rotate 80,

o1' YSprings heretofore used vif set properly for about the hub relative to each other. Each iiydamping low speed high frequency crankshaft wheel portion is subjected to substantially the ViblatOnS Will be tOO Stiff f01` plpelly damping same spring force for yieldingly connecting the high Speed 10W frequency vibrations. As a resame with the hub, since the shoes and friction Sult the usual Clampels are neleientand unmaterialV carried thereby are sufficiently wide 35 satisfactory. l to engage both flywheel portions.

One object of my invention resides in the pro- In operation, the hub 10 rotates in nxed relavsion of a damper which will properly damp tion to the crankshaft A, while the ywheei the vibrations over the Whole range 0f Speeds. structure C is rotated therewith by reason of the 3 5 A further Object Yesides in the pTOVSiOn 0f an friction material 17 secured to the periphery of 90 improved damper of Simple construction canathe shoes. When the crankshaft is free from the ble 0f manufacture at 10W 00Stangular vibrations, either positive or negative, This application iS a CliViSiOn 0f 'my CO-pendthe flywheel structure C rotates as a unit With ing .appliCatOnV Ser. NO- 370,085, led June 11, the hub 10. However, when the crankshaft tends v .f to quickly change its angular velocity as in tor- 95 Further features and advantages 0f my insional vibrations, the inertia of the flywheel VentiOn Will be apparent flOm the fOllOWlng detends to oppose such changes and the vibrations scription of the details of'construction illustrated are thus damped out or dissipated.

in the accompanying drawing in Which, In considering the action of my damper, it

. v Fig. l iS a sectional View 0f my implOVeCl Will be noted that the product of its mass mo- 100 dampe taken Substantially 0n the line 1-1 0f ment of inertia I and the angular acceleration 0 -'Fg. 2, and will increase as the angular acceleration in- Flg- 2 is a SeCtlOnal VIEW taken 0n the 1111 creases and there Will be some value of 0 where .2 2 0f Flg- 1- this product will equal the friction moment M of Reference character A represents the crankthe damper, this friction moment being a, 00n- 105 Shaft from 3nd and B my damper mOimted stant, determined by the tension of the springs thereon' The damper comprises a driving hub 16 and the effectiveness of the friction material i0 keyed at11 tothe crankshaft, the flywheel 17 F10-f Such value of 9 M:1 structure C comprising Vflywheel portions 12 and From this it will be noted that for a higher `13V of different mass o r inertia, the purpose of value of 0 a lower value of I will overcome the 1,10

friction moment M. Of course if a high value of I is available then the friction moment M will also be overcome. Therefore at low speeds where 0 is high both flywheel portions 12 and 13 will slip together. At high speed where 0 is much smaller the flywheel portion 12 of relatively small mass remains stationary relative to the crankshaft and the flywheel portion 13 of relatively great mass will slip alone.

Heretofore with the single flywheel construction the proportion of inertia to friction inoment is determined experimentally at high speed. A damper so made will be active at all speeds.' However, the friction torgue is insuilcient to take care of the high energy of the high frequency vibrations at low speeds. My invention supplies additional friction moment when high frequency vibrations occur, and with my damperV the whole speed range is adequately provided for.

Although I have illustrated but one form of my invention and have described in detail but a single application thereof, it will be apparent to those skilled in the art to which my invention pertains that various modifications and changes may be made therein without departing from the spirit of my invention or from the scope of the appended claims.

What I claim as my invention is:

1. A vibration damper of the character described comprising a driving hub, driven flywheel members independently journaled for rotation about said hub, a shoe, slidably supported intermediate the hub and said members, and a spring between the hub and shoe exerting a yielding pressure on said members.

2. A vibration damper of the character described comprising a driving hub, driven flywheel members of different mass journaled for rotation about said hub, means carried by the hub and adapted for' engagement withv said members, and means exerting a substantial uniform yielding pressure on the first said means to yieldingly connect said flywheel members to said driving hub. f

3. A vibration damper of the character described comprising a driving hub, driven ilywheel members of different mass journaled for rotation about said hub, means disposed about the periphery of said hub and adapted for engagement with said members, and means exerting a substantial uniform yielding pressure on the rst said means to yieldingly connect said flywheel members to said driving hub. 4. A vibration damper of the character described comprising a driving hub, driven ilywheel members of different mass journaled for rotation aboutsaid hub, a plurality of segmental means disposed about the periphery of said hub and adapted for engagement with said members, and means exerting a substantial uniform yielding pressure on said segmental means, to yieldingly connect said flywheel members to said driving hub.

5. A vibration damper of the character described comprising a driving hub, driven flywheel members ofv different mass journaled for rotation about said hub, a plurality of evenly spaced separate segmental means disposed about the peripheryl of said hub and adapted for engagement with said members, and means exerting a substantial uniform yielding pressure on each of said? segmental means to yieldingly con- .nect said flywheel members to said driving hub,

6'. A vibration damper of the character described comprising a driving hub, driven ilywheel members journaled for rotation about said hub, means disposed about the periphery of said hub and adapted for engagement with said members, and means exerting a yielding force radially outwardly on the ilrst said means to yieldingly connect said flywheel members to said vdriving hub.

7. A vibration damper of the character described comprising a driving hub, driven flywheel members journaled for rotation about said hub, a plurality of evenly spaced segmental means disposed about the periphery of said hub and adapted for engagement with saidV members and a spring associated with each segmental means for exerting a force radially outwardly on same to yieldingly connect said ywheel members to said driving hub.

8. In a vibration damper for engine crankshafts, a driving 'hub fixed with the crankshaft, flywheel members of different inertia, means carried by the hub and adapted for engagement with said members, and means exerting a yielding pressureY on the first said 4means to yieldingly connect said flywheel members to said driving hubpone of said flywheel members being adapted to dampen vibrations independently of the other.

9. In a vibration damperY for lengine crankshafts, a driving hub ilXed with' the crankshaft, flywheel members of differentinertia, means disposed about the periphery of said hub and engaged with said flywheelV members, and means exerting a yielding pressure on the rst said means to yieldingly connect said flywheel members to said driving hub, one of said flywheel members being adapted to dampen'vibrations independently ofthe other.Y

10. In a vibration damperv for enginevv crankshafts, a driving hub xed with the crankshaft, flywheelV members of different inertia independently journaled for rotation about said hub, and means intermediate the flywheel members and hub and disposedl about the periphery of the hub for yieldingly connecting the flywheel members with the crankshaft.

1'1. In a vibration damper for engine crankshafts, a driving hub Xed with the crankshaft, a flywheel structure including independent portions of different inertia, and'meansintermediate the flywheel structure and hub and disposed about the periphery of the hub for yieldingly connecting the flywheel structureV with the crankshaft.

12. In a vibration damper for' engine crankshafts, a driving hub ilXedy with. the crankshaft, flywheel portions of different inertia, and means intermediate theA flywheel portions and hub vand disposed about thenperiphery ofthe hub for yieldingly connecting the flywheel' with the crankshaft, one of'said flywheel portions being adapted to dampen vibrations independently of another of said flywheel portions.

13. In av vibration damper for engine crankshafts, a driving' hub 'xed with the crankshaft, flywheel portions of different inertia, spring actuated means intermediate the flywheel portions and hub and disposed about the periphery of the hub for yieldingly connecting the flywheel portions with said driving hub, said flywheel portions being subjected to substantially the same spring yieldingY force.

14. In a Vibration damper for engine crankshafts, a driving hub fixed with the crankshaft,

a member of relatively small mass adapted to dampen high'frequency torsionalv vibrations, a

second member of' relatively great'mass adapted to dampen low frequency torsional vibrations, and means intermediate said members and hub and disposed about the periphery of the hub for yieldingly connecting the said members with the driving hub.

15. In a vibration damper for engine crankshafts, a driving hub xed to the crankshaft, a member of relatively small mass adapted to dampen high frequency torsional Vibrations, a second member of relatively great mass adapted to dampen low frequency torsional vibrations, and means intermediate said members and hub and disposed about the periphery of the hub for yieldingly Connecting the said members with the driving hub, said connecting means including a spring whereby substantially the same yielding force on said members is exerted radially outwardly with respect to the crankshaft axis.

16. In a vibration damper for engine crankshafts, a driving hub xed with the crankshaft, driven flywheel members coaxial with the hub and relatively rotatable with respect to each other about the crankshaft, and means intermediate the flywheel members and hub and disposed about the periphery of the hub for yieldingly connecting the flywheel members with the hub, the inertia of one of said flywheel memf bers diiering from that of the other.

17. A vibration damper comprising a driving hub, driven fiywheel members of different inertia independently journaled for rotation about said hub, and a plurality of segmental means carried by said hub and movable radially with respect to the longitudinal axis of said hub, a spring associated with each of said segmental means for exerting a force directed radially outwardly against said segmental means for yieldingly connecting the said flywheel members and hub.

18. In an engine crankshaft vibration damper, a driving hub fixed to the crankshaft, driven flywheel members one of relatively great mass and another of relatively small mass and independently journaled for rotation about said hub, a shoe intermediate the hub and said flywheel members, and a spring between the hub and shoe exerting a yielding pressure for yieldingly connecting the flywheel members With the hub, said flywheel members cooperating to damp vibrations at relatively low speeds and the flywheel member of relatively great mass acting to damp vibrations at relatively high speeds independently of the other flywheel member.

19. A vibration damper comprising a driving hub, yWheel portions of different inertia journaled for rotation about said hub and axially spaced with respect to each other, means carried by said hub and adapted for engagement with both said flywheel portions, and spring means exerting a yielding force radially outwardly on said first mentioned means to yieldingly connect said flywheel portions to said driving hub, said ywheel portions adapted for relative angular movement during damping action.

ANDRE J. MEYER. 

